/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hudi.common.table.log;

import java.util.Iterator;

public abstract class CachingIterator<T> implements Iterator<T> {

  protected T nextRecord;

  protected abstract boolean doHasNext();

  @Override
  public final boolean hasNext() {
    return nextRecord != null || doHasNext();
  }

  @Override
  public final T next() {
    T record = nextRecord;
    nextRecord = null;
    return record;
  }

}
